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Computer simulation of fatigue under diametrical compression

H. A. Carmona·F. Kun·J. S. Andrade Jr.·H. J. Herrmann
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Abstract

We study the fatigue fracture of disordered materials by means of computer simulations of a discrete element model. We extend a two-dimensional fracture model to capture the microscopic mechanisms relevant for fatigue, and we simulate the diametric compression of a disc shape specimen under a constant external force. The model allows to follow the development of the fracture process on the macro- and micro-level varying the relative influence of the mechanisms of damage accumulation over the load history and healing of microcracks. As a specific example we consider recent experimental results on the fatigue fracture of asphalt. Our numerical simulations show that for intermediate applied loads the lifetime of the specimen presents a power law behavior. Under the effect of healing, more prominent for small loads compared to the tensile strength of the material, the lifetime of the sample increases and a fatigue limit emerges below which no macroscopic failure occurs. The numerical results are in a good qualitative agreement with the experimental findings.

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H. A. Carmona, F. Kun, J. S. Andrade Jr., H. J. Herrmann. 2007-01-25. Computer simulation of fatigue under diametrical compression. https://doi.org/10.1103/physreve.75.046115

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